Carburetor



Aprll 5 1927 y J, w. FISHER CARBURETOR Patented Apr. 5, 1927.

UNITED sf'rn'res*v JOHN. WILLIAM FISHER, OF BL-AGKPQOL, ENGLAND.

CARBURETOR.

Application filed.v July 17,

The present invention relates to improvement-s in carburetor, particularly suitable for internal combustion engines.

. According to the present invention means are provided to spray the fuel into a stream of air which moves in substantially the opposite directiony to the said l'uel spray whereupon the mixture merges into the path oit a supply of air moving parallel with the'fuel supply prior to the mixing ot' this with the oppositely disposed airstream., the Whole then movi-ng into the path of a third air supp-ly also moving parallel with the fuel supply. By this means enrichment ot' the mixture at higher speeds `would be prevented owing to the increase in theretarding eii'ect on they fuel :flow by theoppositely disposed an current as the velocity thereof 11n-creases.

The invention 'is more particularly described with reference to the accompanying'drawings, in which:

Figure l-s `a sectional elevation ot one form of carburetor.

Figure 2 is a planfvieufv ot' the underside and' lower portion of Fig. 1. y

Figure 3 -is a plan view of the means :tor regulating the pilot jet ot' air.

Figure 4 is a planview from below Figure'5. l

Figure 5 is enlarged viewof the jet` `spindle controllingthef'opening of the fuel nozzle.

ized in the carburetor is passedhirom any usual? floatV chamber or the like through a pipe (not shown) to a, nozzle 2; the pipe and nozzle are adapted to be lowered and raised as desired. The opening of the nozzle 2 isv regulated by means of a spindle 3 rotated about its axis, whereby a valve 4 is lowered into the opening of the nozzle 2, to reduce the flow of fuel such as gasoline or the like, therethrough. This is rendered possible by the fact that the shape of the valve al lows `a greater passage `for the fuel at its end than at succeeding positions along its length, in that a number of longitudinal grooves 5 are formed on that end ol' the spindle 3 forming the valve 4 and as shown yin Figs. 4f and 5 the grooves formed on the periphery of the valve decrease and the cross sectional area of the valve increases away from the end of the valve.

Both the nozzle 2 and the valve 4 are i therefore adapted to be displaced relatively to the end 6 of a Wall or tube 7 down which 1924. Serial No. 726,542.

tube a stream or' air passes forming a baille for the fuel suppl y emitted l'i-'omf the nozzle 2.

A tube 35 made of wire gauze7 is provided, attached to the end (5 oit the Wall ol' the baille jet to atomizethe lfuelf simply.A

The tube 7 passes through the carburetor body 8 and is covered at its upper end by a cap or sleeve 9 having ports l() in it which may Wholly or completely colin-ide with corresponding ports ll in the top end ofthe tube. 7. y

Consequently by turning the cap the amount oi" air passiniy down the tube 7 to mix withthe t'uel issuingv from the nozzle 2 can be varied as desired. By means or' the shape of the valve -l= and its grooves, the i iuel supply passing upk the pipe l will continue to travel in a substantially vertical path on reaching the nozzle by the downward `stream of air which has the elifect of preventing enrichment of the mixture at higher speeds. `A handle l2 or remote control can be connected for the operation of the cap 9, so that the latter can be set in any desired position.

rlhe spindle 3v can be regulated by means of the milled head 13 and springs 14 are provided to hold the cap 9 in its position over the top end of the tube 7. While springs `15 are interposed between as flange 16 on ther i y f tube 7 and the bodyfSi ot the carburetor. 'Gasoline or the like liquid `fuel to be atom- An air supply passes through ports in the base of the carburetor registering with port 17 in a. disc 18. This disc is rotated as desrred by a handle' 19', and the adjustability otthis air supply` allows for altered conditions in order to eilect the correct vacuum at the jet. It Will be noticed that this supply of air flows in the same direction as the initial fuel supply.

A conical shaped body 2() having a cylindrical upper portion 2l is provided so that the air entering through the ports 16 and 17 Will Contact with the mixture of the air and liquid fuel issuing through the Wire gauze 35, surrounded by the cup member 2S.

A further air supply passes through ports 22 formed in the lower end of the carburetor body and the opening` of these ports is regulated by means of a sleeve 23 having a number of ports (not shown). The sleeve is regulated by a remote control with the aid of a spring 24 and Bowden Wire 25. The vsupply of air passes up through the carburetor body outside the conical body 2() and is the 27 until it is met last to contact with the fuel supply. The object of this regulated supply is to adjust the mixture in accordance with ruiming conditions caused by changes in temperature or humidity of the atmosphere and the various types of fuel used. The throttle is arranged on the outlet from the carburetor. the throttle valve 26 being regulated by the operating lever QT or other suitable arrangement. There are thus three air supplies viz the tube 6, through the ports 36, and through the ports 22 respectively. The amount of opening of the ports 36 and 11 must be relatively adjusted, but once a desirable mixture of fuel and air is attained such ports 36 always remain at the same degree of opening, any future regulation of air supply during the running of the engine being effected by regulation of the ports 22.

The method of operation of this device is as follows: rIhe fuel passes up the pipe 1 and is met by a stream of air passing down the pipe 7 and is mixed therewith within the cup G. T his mixture then proceeds into the space defined by the walls of the conical member' 20, where it receives a further supply of air which passes through the ports at the bottom of this member. This mixture then passes out of the chamber toward the valve Q6, whereupon it is mixed with a further supply of air which passes through orifices 22 situated in the outer walls of the carburetor. rlChe orifices 11 and the ports at the bottom of the conical chamber 2O are adjusted by the respective control handles 12 and 19 to suit the particular requirements of the particular engine to which attached, and an adjustment of these handles is accomplished when the carburetor is initially fitted to the engine; when once regulated need not be further adjusted unless the valve rods of the engine cylinder or other elements become worn or loose and allow a certain amount of air to pass into and mingle with the mixture. In such a case, the orifices 11 and the said ports are slightly closed to compensate and to restore the mixture to its former proportions. 'Ihe orifices QQ are regulated according to the humidity of temperature of the atmospheric air which enters the carburetor, which may be accomplished by a remote control Q5.

I declare that what I claim is:

1. A carburetor for internal combustion engines comprising a fuel jet, a passage for an air supply moving in a diametrically opposite direction to the fuel supply, ports and a passage for a second air supply moving parallel with the fuel supply, and ports and a passage for a third supply of air substantially adjacent the ports for the second supply of air.

2. A carburetor for internal combustion engines comprising a fuel jet, a passage for an air supply moving in a diametrically opposite direction to the fuel supply, ports and a passage for a second air supply moving parallel with the fuel supply, ports and a passage for a third supply of air substantially adjacent the ports for the second supply of air, and means to isolate the second and third air supplies until the fuel has been partly atomized by the batlling current of air.

3. A carburetor for internal combustion engines comprising a fuel jet, a passage for an air supply moving in a diametrically opposite direction to the fuel supply. ports and a passage for a second air supply moving parallel with the fuel supply, ports and a passage for a third supply of air substantially adjacent the ports for the second supply of air, means to isolate the second and third air supplies until the fuel has been partly atomized by the baffling current of air and a conical shaped member to separate the second and third air currents until the second air current has mixed with the partly atomized mixture.

In witness whereof, I have hereunto signed my name this th dav of June, 19211.

JOHN IVILLIAM FISHER. 

